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+  <title>Image Manipulation Class &mdash; CodeIgniter 3.1.10 documentation</title>
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+<li class="toctree-l2"><a class="reference internal" href="encryption.html">Encryption Library</a></li>
+<li class="toctree-l2"><a class="reference internal" href="file_uploading.html">File Uploading Class</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="ftp.html">FTP Class</a></li>
+<li class="toctree-l2 current"><a class="current reference internal" href="#">Image Manipulation Class</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li>
+</ul>
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+<li class="toctree-l1"><a class="reference internal" href="../contributing/index.html">Contributing to CodeIgniter</a><ul>
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+<li class="toctree-l1"><a class="reference internal" href="../general/index.html">General Topics</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="../general/views.html">Views</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/libraries.html">Using CodeIgniter Libraries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
+</ul>
+</li>
+</ul>
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+<li class="toctree-l1 current"><a class="reference internal" href="index.html">Libraries</a><ul class="current">
+<li class="toctree-l2"><a class="reference internal" href="benchmark.html">Benchmarking Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="caching.html">Caching Driver</a></li>
+<li class="toctree-l2"><a class="reference internal" href="calendar.html">Calendaring Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="cart.html">Shopping Cart Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="config.html">Config Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="email.html">Email Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="encrypt.html">Encrypt Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="encryption.html">Encryption Library</a></li>
+<li class="toctree-l2"><a class="reference internal" href="file_uploading.html">File Uploading Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="form_validation.html">Form Validation</a></li>
+<li class="toctree-l2"><a class="reference internal" href="ftp.html">FTP Class</a></li>
+<li class="toctree-l2 current"><a class="current reference internal" href="#">Image Manipulation Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="input.html">Input Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="javascript.html">Javascript Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="language.html">Language Class</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="output.html">Output Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="pagination.html">Pagination Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="parser.html">Template Parser Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="security.html">Security Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="sessions.html">Session Library</a></li>
+<li class="toctree-l2"><a class="reference internal" href="table.html">HTML Table Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="trackback.html">Trackback Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="typography.html">Typography Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="unit_testing.html">Unit Testing Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="uri.html">URI Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="user_agent.html">User Agent Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="zip.html">Zip Encoding Class</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
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+</ul>
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+
+          
+        
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+
+      
+      <nav class="wy-nav-top" role="navigation" aria-label="top navigation">
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+        <a href="../index.html">CodeIgniter</a>
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+    <li><a href="../index.html">Docs</a> &raquo;</li>
+      
+        <li><a href="index.html">Libraries</a> &raquo;</li>
+      
+    <li>Image Manipulation Class</li>
+    <li class="wy-breadcrumbs-aside">
+      
+    </li>
+    <div style="float:right;margin-left:5px;" id="closeMe">
+      <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" />
+    </div>
+  </ul>
+  <hr/>
+</div>
+          <div role="main" class="document">
+            
+  <div class="section" id="image-manipulation-class">
+<h1>Image Manipulation Class<a class="headerlink" href="#image-manipulation-class" title="Permalink to this headline">¶</a></h1>
+<p>CodeIgniter’s Image Manipulation class lets you perform the following
+actions:</p>
+<ul class="simple">
+<li>Image Resizing</li>
+<li>Thumbnail Creation</li>
+<li>Image Cropping</li>
+<li>Image Rotating</li>
+<li>Image Watermarking</li>
+</ul>
+<p>All three major image libraries are supported: GD/GD2, NetPBM, and
+ImageMagick</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">Watermarking is only available using the GD/GD2 library. In
+addition, even though other libraries are supported, GD is required in
+order for the script to calculate the image properties. The image
+processing, however, will be performed with the library you specify.</p>
+</div>
+<div class="contents local topic" id="contents">
+<ul class="simple">
+<li><a class="reference internal" href="#initializing-the-class" id="id1">Initializing the Class</a><ul>
+<li><a class="reference internal" href="#processing-an-image" id="id2">Processing an Image</a></li>
+<li><a class="reference internal" href="#processing-methods" id="id3">Processing Methods</a></li>
+<li><a class="reference internal" href="#preferences" id="id4">Preferences</a></li>
+<li><a class="reference internal" href="#setting-preferences-in-a-config-file" id="id5">Setting preferences in a config file</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#image-watermarking" id="id6">Image Watermarking</a><ul>
+<li><a class="reference internal" href="#two-types-of-watermarking" id="id7">Two Types of Watermarking</a></li>
+<li><a class="reference internal" href="#watermarking-an-image" id="id8">Watermarking an Image</a></li>
+<li><a class="reference internal" href="#watermarking-preferences" id="id9">Watermarking Preferences</a><ul>
+<li><a class="reference internal" href="#text-preferences" id="id10">Text Preferences</a></li>
+<li><a class="reference internal" href="#overlay-preferences" id="id11">Overlay Preferences</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li><a class="reference internal" href="#class-reference" id="id12">Class Reference</a></li>
+</ul>
+</div>
+<div class="custom-index container"></div><div class="section" id="initializing-the-class">
+<h2><a class="toc-backref" href="#id1">Initializing the Class</a><a class="headerlink" href="#initializing-the-class" title="Permalink to this headline">¶</a></h2>
+<p>Like most other classes in CodeIgniter, the image class is initialized
+in your controller using the $this-&gt;load-&gt;library function:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;image_lib&#39;</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>Once the library is loaded it will be ready for use. The image library
+object you will use to call all functions is: <code class="docutils literal"><span class="pre">$this-&gt;image_lib</span></code></p>
+<div class="section" id="processing-an-image">
+<h3><a class="toc-backref" href="#id2">Processing an Image</a><a class="headerlink" href="#processing-an-image" title="Permalink to this headline">¶</a></h3>
+<p>Regardless of the type of processing you would like to perform
+(resizing, cropping, rotation, or watermarking), the general process is
+identical. You will set some preferences corresponding to the action you
+intend to perform, then call one of four available processing functions.
+For example, to create an image thumbnail you’ll do this:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;image_library&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;gd2&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;source_image&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/path/to/image/mypic.jpg&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;create_thumb&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;maintain_ratio&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;width&#39;</span><span class="p">]</span>         <span class="o">=</span> <span class="mi">75</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;height&#39;</span><span class="p">]</span>       <span class="o">=</span> <span class="mi">50</span><span class="p">;</span>
+
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;image_lib&#39;</span><span class="p">,</span> <span class="nv">$config</span><span class="p">);</span>
+
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">resize</span><span class="p">();</span>
+</pre></div>
+</div>
+<p>The above code tells the image_resize function to look for an image
+called <em>mypic.jpg</em> located in the source_image folder, then create a
+thumbnail that is 75 X 50 pixels using the GD2 image_library. Since the
+maintain_ratio option is enabled, the thumb will be as close to the
+target width and height as possible while preserving the original aspect
+ratio. The thumbnail will be called <em>mypic_thumb.jpg</em> and located at
+the same level as <em>source_image</em>.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">In order for the image class to be allowed to do any
+processing, the folder containing the image files must have write
+permissions.</p>
+</div>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">Image processing can require a considerable amount of server
+memory for some operations. If you are experiencing out of memory errors
+while processing images you may need to limit their maximum size, and/or
+adjust PHP memory limits.</p>
+</div>
+</div>
+<div class="section" id="processing-methods">
+<h3><a class="toc-backref" href="#id3">Processing Methods</a><a class="headerlink" href="#processing-methods" title="Permalink to this headline">¶</a></h3>
+<p>There are four available processing methods:</p>
+<ul class="simple">
+<li>$this-&gt;image_lib-&gt;resize()</li>
+<li>$this-&gt;image_lib-&gt;crop()</li>
+<li>$this-&gt;image_lib-&gt;rotate()</li>
+<li>$this-&gt;image_lib-&gt;watermark()</li>
+</ul>
+<p>These methods return boolean TRUE upon success and FALSE for failure.
+If they fail you can retrieve the error message using this function:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">display_errors</span><span class="p">();</span>
+</pre></div>
+</div>
+<p>A good practice is to use the processing function conditionally, showing an
+error upon failure, like this:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">resize</span><span class="p">())</span>
+<span class="p">{</span>
+        <span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">display_errors</span><span class="p">();</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p>You can optionally specify the HTML formatting to be applied to
+the errors, by submitting the opening/closing tags in the function,
+like this:</p>
+<div class="last highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">display_errors</span><span class="p">(</span><span class="s1">&#39;&lt;p&gt;&#39;</span><span class="p">,</span> <span class="s1">&#39;&lt;/p&gt;&#39;</span><span class="p">);</span>
+</pre></div>
+</div>
+</div>
+</div>
+<div class="section" id="preferences">
+<span id="processing-preferences"></span><h3><a class="toc-backref" href="#id4">Preferences</a><a class="headerlink" href="#preferences" title="Permalink to this headline">¶</a></h3>
+<p>The preferences described below allow you to tailor the image processing
+to suit your needs.</p>
+<p>Note that not all preferences are available for every function. For
+example, the x/y axis preferences are only available for image cropping.
+Likewise, the width and height preferences have no effect on cropping.
+The “availability” column indicates which functions support a given
+preference.</p>
+<p>Availability Legend:</p>
+<ul class="simple">
+<li>R - Image Resizing</li>
+<li>C - Image Cropping</li>
+<li>X - Image Rotation</li>
+<li>W - Image Watermarking</li>
+</ul>
+<table border="1" class="docutils">
+<colgroup>
+<col width="14%" />
+<col width="14%" />
+<col width="19%" />
+<col width="45%" />
+<col width="8%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">Preference</th>
+<th class="head">Default Value</th>
+<th class="head">Options</th>
+<th class="head">Description</th>
+<th class="head">Availability</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td><strong>image_library</strong></td>
+<td>GD2</td>
+<td>GD, GD2, ImageMagick, NetPBM</td>
+<td>Sets the image library to be used.</td>
+<td>R, C, X, W</td>
+</tr>
+<tr class="row-odd"><td><strong>library_path</strong></td>
+<td>None</td>
+<td>None</td>
+<td>Sets the server path to your ImageMagick or NetPBM library. If you use
+either of those libraries you must supply the path.</td>
+<td>R, C, X
+R, C, S, W</td>
+</tr>
+<tr class="row-even"><td><strong>source_image</strong></td>
+<td>None</td>
+<td>None</td>
+<td>Sets the source image name/path. The path must be a relative or absolute
+server path, not a URL.</td>
+<td>&#160;</td>
+</tr>
+<tr class="row-odd"><td><strong>dynamic_output</strong></td>
+<td>FALSE</td>
+<td>TRUE/FALSE (boolean)</td>
+<td>Determines whether the new image file should be written to disk or
+generated dynamically. Note: If you choose the dynamic setting, only one
+image can be shown at a time, and it can’t be positioned on the page. It
+simply outputs the raw image dynamically to your browser, along with
+image headers.</td>
+<td>R, C, X, W</td>
+</tr>
+<tr class="row-even"><td><strong>file_permissions</strong></td>
+<td>0644</td>
+<td>(integer)</td>
+<td>File system permissions to apply on the resulting image file,
+writing it to the disk. WARNING: Use octal integer notation!</td>
+<td>R, C, X, W</td>
+</tr>
+<tr class="row-odd"><td><strong>quality</strong></td>
+<td>90%</td>
+<td>1 - 100%</td>
+<td>Sets the quality of the image. The higher the quality the larger the
+file size.</td>
+<td>R, C, X, W</td>
+</tr>
+<tr class="row-even"><td><strong>new_image</strong></td>
+<td>None</td>
+<td>None</td>
+<td>Sets the destination image name/path. You’ll use this preference when
+creating an image copy. The path must be a relative or absolute server
+path, not a URL.</td>
+<td>R, C, X, W</td>
+</tr>
+<tr class="row-odd"><td><strong>width</strong></td>
+<td>None</td>
+<td>None</td>
+<td>Sets the width you would like the image set to.</td>
+<td>R, C</td>
+</tr>
+<tr class="row-even"><td><strong>height</strong></td>
+<td>None</td>
+<td>None</td>
+<td>Sets the height you would like the image set to.</td>
+<td>R, C</td>
+</tr>
+<tr class="row-odd"><td><strong>create_thumb</strong></td>
+<td>FALSE</td>
+<td>TRUE/FALSE (boolean)</td>
+<td>Tells the image processing function to create a thumb.</td>
+<td>R</td>
+</tr>
+<tr class="row-even"><td><strong>thumb_marker</strong></td>
+<td>_thumb</td>
+<td>None</td>
+<td>Specifies the thumbnail indicator. It will be inserted just before the
+file extension, so mypic.jpg would become mypic_thumb.jpg</td>
+<td>R</td>
+</tr>
+<tr class="row-odd"><td><strong>maintain_ratio</strong></td>
+<td>TRUE</td>
+<td>TRUE/FALSE (boolean)</td>
+<td>Specifies whether to maintain the original aspect ratio when resizing or
+use hard values.</td>
+<td>R, C</td>
+</tr>
+<tr class="row-even"><td><strong>master_dim</strong></td>
+<td>auto</td>
+<td>auto, width, height</td>
+<td>Specifies what to use as the master axis when resizing or creating
+thumbs. For example, let’s say you want to resize an image to 100 X 75
+pixels. If the source image size does not allow perfect resizing to
+those dimensions, this setting determines which axis should be used as
+the hard value. “auto” sets the axis automatically based on whether the
+image is taller than wider, or vice versa.</td>
+<td>R</td>
+</tr>
+<tr class="row-odd"><td><strong>rotation_angle</strong></td>
+<td>None</td>
+<td>90, 180, 270, vrt, hor</td>
+<td>Specifies the angle of rotation when rotating images. Note that PHP
+rotates counter-clockwise, so a 90 degree rotation to the right must be
+specified as 270.</td>
+<td>X</td>
+</tr>
+<tr class="row-even"><td><strong>x_axis</strong></td>
+<td>None</td>
+<td>None</td>
+<td>Sets the X coordinate in pixels for image cropping. For example, a
+setting of 30 will crop an image 30 pixels from the left.</td>
+<td>C</td>
+</tr>
+<tr class="row-odd"><td><strong>y_axis</strong></td>
+<td>None</td>
+<td>None</td>
+<td>Sets the Y coordinate in pixels for image cropping. For example, a
+setting of 30 will crop an image 30 pixels from the top.</td>
+<td>C</td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="section" id="setting-preferences-in-a-config-file">
+<h3><a class="toc-backref" href="#id5">Setting preferences in a config file</a><a class="headerlink" href="#setting-preferences-in-a-config-file" title="Permalink to this headline">¶</a></h3>
+<p>If you prefer not to set preferences using the above method, you can
+instead put them into a config file. Simply create a new file called
+image_lib.php, add the $config array in that file. Then save the file
+in <em>config/image_lib.php</em> and it will be used automatically. You will
+NOT need to use the <code class="docutils literal"><span class="pre">$this-&gt;image_lib-&gt;initialize()</span></code> method if you save
+your preferences in a config file.</p>
+</div>
+</div>
+<div class="section" id="image-watermarking">
+<h2><a class="toc-backref" href="#id6">Image Watermarking</a><a class="headerlink" href="#image-watermarking" title="Permalink to this headline">¶</a></h2>
+<p>The Watermarking feature requires the GD/GD2 library.</p>
+<div class="section" id="two-types-of-watermarking">
+<h3><a class="toc-backref" href="#id7">Two Types of Watermarking</a><a class="headerlink" href="#two-types-of-watermarking" title="Permalink to this headline">¶</a></h3>
+<p>There are two types of watermarking that you can use:</p>
+<ul class="simple">
+<li><strong>Text</strong>: The watermark message will be generated using text, either
+with a True Type font that you specify, or using the native text
+output that the GD library supports. If you use the True Type version
+your GD installation must be compiled with True Type support (most
+are, but not all).</li>
+<li><strong>Overlay</strong>: The watermark message will be generated by overlaying an
+image (usually a transparent PNG or GIF) containing your watermark
+over the source image.</li>
+</ul>
+</div>
+<div class="section" id="watermarking-an-image">
+<span id="watermarking"></span><h3><a class="toc-backref" href="#id8">Watermarking an Image</a><a class="headerlink" href="#watermarking-an-image" title="Permalink to this headline">¶</a></h3>
+<p>Just as with the other methods (resizing, cropping, and rotating) the
+general process for watermarking involves setting the preferences
+corresponding to the action you intend to perform, then calling the
+watermark function. Here is an example:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;source_image&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/path/to/image/mypic.jpg&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_text&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;Copyright 2006 - John Doe&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_type&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;text&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_font_path&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;./system/fonts/texb.ttf&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_font_size&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;16&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_font_color&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;ffffff&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_vrt_alignment&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;bottom&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_hor_alignment&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;center&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;wm_padding&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;20&#39;</span><span class="p">;</span>
+
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span>
+
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">watermark</span><span class="p">();</span>
+</pre></div>
+</div>
+<p>The above example will use a 16 pixel True Type font to create the text
+“Copyright 2006 - John Doe”. The watermark will be positioned at the
+bottom/center of the image, 20 pixels from the bottom of the image.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">In order for the image class to be allowed to do any
+processing, the image file must have “write” file permissions
+For example, 777.</p>
+</div>
+</div>
+<div class="section" id="watermarking-preferences">
+<h3><a class="toc-backref" href="#id9">Watermarking Preferences</a><a class="headerlink" href="#watermarking-preferences" title="Permalink to this headline">¶</a></h3>
+<p>This table shows the preferences that are available for both types of
+watermarking (text or overlay)</p>
+<table border="1" class="docutils">
+<colgroup>
+<col width="17%" />
+<col width="14%" />
+<col width="17%" />
+<col width="53%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">Preference</th>
+<th class="head">Default Value</th>
+<th class="head">Options</th>
+<th class="head">Description</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td><strong>wm_type</strong></td>
+<td>text</td>
+<td>text, overlay</td>
+<td>Sets the type of watermarking that should be used.</td>
+</tr>
+<tr class="row-odd"><td><strong>source_image</strong></td>
+<td>None</td>
+<td>None</td>
+<td>Sets the source image name/path. The path must be a relative or absolute
+server path, not a URL.</td>
+</tr>
+<tr class="row-even"><td><strong>dynamic_output</strong></td>
+<td>FALSE</td>
+<td>TRUE/FALSE (boolean)</td>
+<td>Determines whether the new image file should be written to disk or
+generated dynamically. Note: If you choose the dynamic setting, only one
+image can be shown at a time, and it can’t be positioned on the page. It
+simply outputs the raw image dynamically to your browser, along with
+image headers.</td>
+</tr>
+<tr class="row-odd"><td><strong>quality</strong></td>
+<td>90%</td>
+<td>1 - 100%</td>
+<td>Sets the quality of the image. The higher the quality the larger the
+file size.</td>
+</tr>
+<tr class="row-even"><td><strong>wm_padding</strong></td>
+<td>None</td>
+<td>A number</td>
+<td>The amount of padding, set in pixels, that will be applied to the
+watermark to set it away from the edge of your images.</td>
+</tr>
+<tr class="row-odd"><td><strong>wm_vrt_alignment</strong></td>
+<td>bottom</td>
+<td>top, middle, bottom</td>
+<td>Sets the vertical alignment for the watermark image.</td>
+</tr>
+<tr class="row-even"><td><strong>wm_hor_alignment</strong></td>
+<td>center</td>
+<td>left, center, right</td>
+<td>Sets the horizontal alignment for the watermark image.</td>
+</tr>
+<tr class="row-odd"><td><strong>wm_hor_offset</strong></td>
+<td>None</td>
+<td>None</td>
+<td>You may specify a horizontal offset (in pixels) to apply to the
+watermark position. The offset normally moves the watermark to the
+right, except if you have your alignment set to “right” then your offset
+value will move the watermark toward the left of the image.</td>
+</tr>
+<tr class="row-even"><td><strong>wm_vrt_offset</strong></td>
+<td>None</td>
+<td>None</td>
+<td>You may specify a vertical offset (in pixels) to apply to the watermark
+position. The offset normally moves the watermark down, except if you
+have your alignment set to “bottom” then your offset value will move the
+watermark toward the top of the image.</td>
+</tr>
+</tbody>
+</table>
+<div class="section" id="text-preferences">
+<h4><a class="toc-backref" href="#id10">Text Preferences</a><a class="headerlink" href="#text-preferences" title="Permalink to this headline">¶</a></h4>
+<p>This table shows the preferences that are available for the text type of
+watermarking.</p>
+<table border="1" class="docutils">
+<colgroup>
+<col width="17%" />
+<col width="14%" />
+<col width="14%" />
+<col width="55%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">Preference</th>
+<th class="head">Default Value</th>
+<th class="head">Options</th>
+<th class="head">Description</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td><strong>wm_text</strong></td>
+<td>None</td>
+<td>None</td>
+<td>The text you would like shown as the watermark. Typically this will be a
+copyright notice.</td>
+</tr>
+<tr class="row-odd"><td><strong>wm_font_path</strong></td>
+<td>None</td>
+<td>None</td>
+<td>The server path to the True Type Font you would like to use. If you do
+not use this option, the native GD font will be used.</td>
+</tr>
+<tr class="row-even"><td><strong>wm_font_size</strong></td>
+<td>16</td>
+<td>None</td>
+<td>The size of the text. Note: If you are not using the True Type option
+above, the number is set using a range of 1 - 5. Otherwise, you can use
+any valid pixel size for the font you’re using.</td>
+</tr>
+<tr class="row-odd"><td><strong>wm_font_color</strong></td>
+<td>ffffff</td>
+<td>None</td>
+<td>The font color, specified in hex. Both the full 6-length (ie, 993300) and
+the short three character abbreviated version (ie, fff) are supported.</td>
+</tr>
+<tr class="row-even"><td><strong>wm_shadow_color</strong></td>
+<td>None</td>
+<td>None</td>
+<td>The color of the drop shadow, specified in hex. If you leave this blank
+a drop shadow will not be used. Both the full 6-length (ie, 993300) and
+the short three character abbreviated version (ie, fff) are supported.</td>
+</tr>
+<tr class="row-odd"><td><strong>wm_shadow_distance</strong></td>
+<td>3</td>
+<td>None</td>
+<td>The distance (in pixels) from the font that the drop shadow should
+appear.</td>
+</tr>
+</tbody>
+</table>
+</div>
+<div class="section" id="overlay-preferences">
+<h4><a class="toc-backref" href="#id11">Overlay Preferences</a><a class="headerlink" href="#overlay-preferences" title="Permalink to this headline">¶</a></h4>
+<p>This table shows the preferences that are available for the overlay type
+of watermarking.</p>
+<table border="1" class="docutils">
+<colgroup>
+<col width="17%" />
+<col width="14%" />
+<col width="14%" />
+<col width="55%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">Preference</th>
+<th class="head">Default Value</th>
+<th class="head">Options</th>
+<th class="head">Description</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td><strong>wm_overlay_path</strong></td>
+<td>None</td>
+<td>None</td>
+<td>The server path to the image you wish to use as your watermark. Required
+only if you are using the overlay method.</td>
+</tr>
+<tr class="row-odd"><td><strong>wm_opacity</strong></td>
+<td>50</td>
+<td>1 - 100</td>
+<td>Image opacity. You may specify the opacity (i.e. transparency) of your
+watermark image. This allows the watermark to be faint and not
+completely obscure the details from the original image behind it. A 50%
+opacity is typical.</td>
+</tr>
+<tr class="row-even"><td><strong>wm_x_transp</strong></td>
+<td>4</td>
+<td>A number</td>
+<td>If your watermark image is a PNG or GIF image, you may specify a color
+on the image to be “transparent”. This setting (along with the next)
+will allow you to specify that color. This works by specifying the “X”
+and “Y” coordinate pixel (measured from the upper left) within the image
+that corresponds to a pixel representative of the color you want to be
+transparent.</td>
+</tr>
+<tr class="row-odd"><td><strong>wm_y_transp</strong></td>
+<td>4</td>
+<td>A number</td>
+<td>Along with the previous setting, this allows you to specify the
+coordinate to a pixel representative of the color you want to be
+transparent.</td>
+</tr>
+</tbody>
+</table>
+</div>
+</div>
+</div>
+<div class="section" id="class-reference">
+<h2><a class="toc-backref" href="#id12">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
+<dl class="class">
+<dt id="CI_Image_lib">
+<em class="property">class </em><code class="descname">CI_Image_lib</code><a class="headerlink" href="#CI_Image_lib" title="Permalink to this definition">¶</a></dt>
+<dd><dl class="method">
+<dt id="CI_Image_lib::initialize">
+<code class="descname">initialize</code><span class="sig-paren">(</span><span class="optional">[</span><em>$props = array()</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::initialize" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$props</strong> (<em>array</em>) – Image processing preferences</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE in case of invalid settings</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Initializes the class for processing an image.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Image_lib::resize">
+<code class="descname">resize</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::resize" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
+</tr>
+</tbody>
+</table>
+<p>The image resizing method lets you resize the original image, create a
+copy (with or without resizing), or create a thumbnail image.</p>
+<p>For practical purposes there is no difference between creating a copy
+and creating a thumbnail except a thumb will have the thumbnail marker
+as part of the name (i.e. mypic_thumb.jpg).</p>
+<p>All preferences listed in the <a class="reference internal" href="#processing-preferences"><span class="std std-ref">Preferences</span></a> table are available for this
+method except these three: <em>rotation_angle</em>, <em>x_axis</em> and <em>y_axis</em>.</p>
+<p><strong>Creating a Thumbnail</strong></p>
+<p>The resizing method will create a thumbnail file (and preserve the
+original) if you set this preference to TRUE:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;create_thumb&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>This single preference determines whether a thumbnail is created or not.</p>
+<p><strong>Creating a Copy</strong></p>
+<p>The resizing method will create a copy of the image file (and preserve
+the original) if you set a path and/or a new filename using this
+preference:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;new_image&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/path/to/new_image.jpg&#39;</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>Notes regarding this preference:</p>
+<ul class="simple">
+<li>If only the new image name is specified it will be placed in the same
+folder as the original</li>
+<li>If only the path is specified, the new image will be placed in the
+destination with the same name as the original.</li>
+<li>If both the path and image name are specified it will placed in its
+own destination and given the new name.</li>
+</ul>
+<p><strong>Resizing the Original Image</strong></p>
+<p>If neither of the two preferences listed above (create_thumb, and
+new_image) are used, the resizing method will instead target the
+original image for processing.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Image_lib::crop">
+<code class="descname">crop</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::crop" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
+</tr>
+</tbody>
+</table>
+<p>The cropping method works nearly identically to the resizing function
+except it requires that you set preferences for the X and Y axis (in
+pixels) specifying where to crop, like this:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;x_axis&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">100</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;y_axis&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">40</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>All preferences listed in the <a class="reference internal" href="#processing-preferences"><span class="std std-ref">Preferences</span></a> table are available for this
+method except these: <em>rotation_angle</em>, <em>create_thumb</em> and <em>new_image</em>.</p>
+<p>Here’s an example showing how you might crop an image:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;image_library&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;imagemagick&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;library_path&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/usr/X11R6/bin/&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;source_image&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/path/to/image/mypic.jpg&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;x_axis&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">100</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;y_axis&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">60</span><span class="p">;</span>
+
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span>
+
+<span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">crop</span><span class="p">())</span>
+<span class="p">{</span>
+        <span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">display_errors</span><span class="p">();</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">Without a visual interface it is difficult to crop images, so this
+method is not very useful unless you intend to build such an
+interface. That’s exactly what we did using for the photo gallery module
+in ExpressionEngine, the CMS we develop. We added a JavaScript UI that
+lets the cropping area be selected.</p>
+</div>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Image_lib::rotate">
+<code class="descname">rotate</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::rotate" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
+</tr>
+</tbody>
+</table>
+<p>The image rotation method requires that the angle of rotation be set
+via its preference:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;rotation_angle&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;90&#39;</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>There are 5 rotation options:</p>
+<ol class="arabic simple">
+<li>90 - rotates counter-clockwise by 90 degrees.</li>
+<li>180 - rotates counter-clockwise by 180 degrees.</li>
+<li>270 - rotates counter-clockwise by 270 degrees.</li>
+<li>hor - flips the image horizontally.</li>
+<li>vrt - flips the image vertically.</li>
+</ol>
+<p>Here’s an example showing how you might rotate an image:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;image_library&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;netpbm&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;library_path&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/usr/bin/&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;source_image&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/path/to/image/mypic.jpg&#39;</span><span class="p">;</span>
+<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;rotation_angle&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;hor&#39;</span><span class="p">;</span>
+
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">initialize</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span>
+
+<span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">rotate</span><span class="p">())</span>
+<span class="p">{</span>
+        <span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">display_errors</span><span class="p">();</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Image_lib::watermark">
+<code class="descname">watermark</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::watermark" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
+</tr>
+</tbody>
+</table>
+<p>Creates a watermark over an image, please refer to the <a class="reference internal" href="#watermarking"><span class="std std-ref">Watermarking an Image</span></a>
+section for more info.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Image_lib::clear">
+<code class="descname">clear</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::clear" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">void</td>
+</tr>
+</tbody>
+</table>
+<p>The clear method resets all of the values used when processing an
+image. You will want to call this if you are processing images in a
+loop.</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">clear</span><span class="p">();</span>
+</pre></div>
+</div>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_Image_lib::display_errors">
+<code class="descname">display_errors</code><span class="sig-paren">(</span><span class="optional">[</span><em>$open = '&lt;p&gt;</em><span class="optional">[</span>, <em>$close = '&lt;/p&gt;'</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Image_lib::display_errors" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$open</strong> (<em>string</em>) – Error message opening tag</li>
+<li><strong>$close</strong> (<em>string</em>) – Error message closing tag</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Error messages</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Returns all detected errors formatted as a string.</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">image_lib</span><span class="o">-&gt;</span><span class="na">display_errors</span><span class="p">();</span>
+</pre></div>
+</div>
+</dd></dl>
+
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+
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